content: /* Copyright (C) 2016-2018 Alibaba Group Holding Limited
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  ==============================================================================*/
  
  // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
  //     * Neither the name of Google Inc. nor the names of its
  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf;
  
  import static protobuf_unittest.UnittestProto.optionalInt32Extension;
  
  import protobuf_unittest.UnittestProto.TestAllExtensions;
  import protobuf_unittest.UnittestProto.TestAllTypes;
  import java.io.IOException;
  import junit.framework.TestCase;
  
  /**
   * Unit test for {@link LazyFieldLite}.
   *
   * @author xiangl@google.com (Xiang Li)
   */
  public class LazyFieldLiteTest extends TestCase {
  
    public void testGetValue() {
      MessageLite message = TestUtil.getAllSet();
      LazyFieldLite lazyField = createLazyFieldLiteFromMessage(message);
      assertEquals(message, lazyField.getValue(TestAllTypes.getDefaultInstance()));
      changeValue(lazyField);
      assertNotEqual(message, lazyField.getValue(TestAllTypes.getDefaultInstance()));
    }
  
    public void testGetValueEx() throws Exception {
      TestAllExtensions message = TestUtil.getAllExtensionsSet();
      LazyFieldLite lazyField = createLazyFieldLiteFromMessage(message);
      assertEquals(message, lazyField.getValue(TestAllExtensions.getDefaultInstance()));
      changeValue(lazyField);
      assertNotEqual(message, lazyField.getValue(TestAllExtensions.getDefaultInstance()));
    }
  
    public void testSetValue() {
      MessageLite message = TestUtil.getAllSet();
      LazyFieldLite lazyField = createLazyFieldLiteFromMessage(message);
      changeValue(lazyField);
      assertNotEqual(message, lazyField.getValue(TestAllTypes.getDefaultInstance()));
      message = lazyField.getValue(TestAllTypes.getDefaultInstance());
      changeValue(lazyField);
      assertEquals(message, lazyField.getValue(TestAllTypes.getDefaultInstance()));
    }
  
    public void testSetValueEx() throws Exception {
      TestAllExtensions message = TestUtil.getAllExtensionsSet();
      LazyFieldLite lazyField = createLazyFieldLiteFromMessage(message);
      changeValue(lazyField);
      assertNotEqual(message, lazyField.getValue(TestAllExtensions.getDefaultInstance()));
      MessageLite value = lazyField.getValue(TestAllExtensions.getDefaultInstance());
      changeValue(lazyField);
      assertEquals(value, lazyField.getValue(TestAllExtensions.getDefaultInstance()));
    }
  
    public void testGetSerializedSize() {
      MessageLite message = TestUtil.getAllSet();
      LazyFieldLite lazyField = createLazyFieldLiteFromMessage(message);
      assertEquals(message.getSerializedSize(), lazyField.getSerializedSize());
      changeValue(lazyField);
      assertNotEqual(message.getSerializedSize(), lazyField.getSerializedSize());
    }
  
    public void testGetSerializedSizeEx() throws Exception {
      TestAllExtensions message = TestUtil.getAllExtensionsSet();
      LazyFieldLite lazyField = createLazyFieldLiteFromMessage(message);
      assertEquals(message.getSerializedSize(), lazyField.getSerializedSize());
      changeValue(lazyField);
      assertNotEqual(message.getSerializedSize(), lazyField.getSerializedSize());
    }
  
    public void testGetByteString() {
      MessageLite message = TestUtil.getAllSet();
      LazyFieldLite lazyField = createLazyFieldLiteFromMessage(message);
      assertEquals(message.toByteString(), lazyField.toByteString());
      changeValue(lazyField);
      assertNotEqual(message.toByteString(), lazyField.toByteString());
    }
  
    public void testGetByteStringEx() throws Exception {
      TestAllExtensions message = TestUtil.getAllExtensionsSet();
      LazyFieldLite lazyField = createLazyFieldLiteFromMessage(message);
      assertEquals(message.toByteString(), lazyField.toByteString());
      changeValue(lazyField);
      assertNotEqual(message.toByteString(), lazyField.toByteString());
    }
  
    public void testMergeExtensions() throws Exception {
      TestAllExtensions message = TestUtil.getAllExtensionsSet();
      LazyFieldLite original = createLazyFieldLiteFromMessage(message);
      LazyFieldLite merged = new LazyFieldLite();
      merged.merge(original);
      TestAllExtensions value = (TestAllExtensions) merged.getValue(
          TestAllExtensions.getDefaultInstance());
      assertEquals(message, value);
    }
  
    public void testEmptyLazyField() throws Exception {
      LazyFieldLite field = new LazyFieldLite();
      assertEquals(0, field.getSerializedSize());
      assertEquals(ByteString.EMPTY, field.toByteString());
    }
  
    public void testInvalidProto() throws Exception {
      // Silently fails and uses the default instance.
      LazyFieldLite field = new LazyFieldLite(
          TestUtil.getExtensionRegistry(), ByteString.copyFromUtf8("invalid"));
      assertEquals(
          TestAllTypes.getDefaultInstance(), field.getValue(TestAllTypes.getDefaultInstance()));
      assertEquals(0, field.getSerializedSize());
      assertEquals(ByteString.EMPTY, field.toByteString());
    }
  
    public void testMergeBeforeParsing() throws Exception {
      TestAllTypes message1 = TestAllTypes.newBuilder().setOptionalInt32(1).build();
      LazyFieldLite field1 = createLazyFieldLiteFromMessage(message1);
      TestAllTypes message2 = TestAllTypes.newBuilder().setOptionalInt64(2).build();
      LazyFieldLite field2 = createLazyFieldLiteFromMessage(message2);
  
      field1.merge(field2);
      TestAllTypes expected =
          TestAllTypes.newBuilder().setOptionalInt32(1).setOptionalInt64(2).build();
      assertEquals(expected, field1.getValue(TestAllTypes.getDefaultInstance()));
    }
  
    public void testMergeOneNotParsed() throws Exception {
      // Test a few different paths that involve one message that was not parsed.
      TestAllTypes message1 = TestAllTypes.newBuilder().setOptionalInt32(1).build();
      TestAllTypes message2 = TestAllTypes.newBuilder().setOptionalInt64(2).build();
      TestAllTypes expected =
          TestAllTypes.newBuilder().setOptionalInt32(1).setOptionalInt64(2).build();
  
      LazyFieldLite field1 = LazyFieldLite.fromValue(message1);
      field1.getValue(TestAllTypes.getDefaultInstance());  // Force parsing.
      LazyFieldLite field2 = createLazyFieldLiteFromMessage(message2);
      field1.merge(field2);
      assertEquals(expected, field1.getValue(TestAllTypes.getDefaultInstance()));
  
      // Now reverse which one is parsed first.
      field1 = LazyFieldLite.fromValue(message1);
      field2 = createLazyFieldLiteFromMessage(message2);
      field2.getValue(TestAllTypes.getDefaultInstance());  // Force parsing.
      field1.merge(field2);
      assertEquals(expected, field1.getValue(TestAllTypes.getDefaultInstance()));
    }
  
    public void testMergeInvalid() throws Exception {
      // Test a few different paths that involve one message that was not parsed.
      TestAllTypes message = TestAllTypes.newBuilder().setOptionalInt32(1).build();
      LazyFieldLite valid = LazyFieldLite.fromValue(message);
      LazyFieldLite invalid = new LazyFieldLite(
          TestUtil.getExtensionRegistry(), ByteString.copyFromUtf8("invalid"));
      invalid.merge(valid);
  
      // We swallow the exception and just use the set field.
      assertEquals(message, invalid.getValue(TestAllTypes.getDefaultInstance()));
    }
  
    public void testMergeKeepsExtensionsWhenPossible() throws Exception {
      // In this test we attempt to only use the empty registry, which will strip out all extensions
      // when serializing and then parsing. We verify that each code path will attempt to not
      // serialize and parse a message that was set directly without going through the
      // extensionRegistry.
      TestAllExtensions messageWithExtensions =
          TestAllExtensions.newBuilder().setExtension(optionalInt32Extension, 42).build();
      TestAllExtensions emptyMessage = TestAllExtensions.newBuilder().build();
  
      ExtensionRegistryLite emptyRegistry = ExtensionRegistryLite.getEmptyRegistry();
  
      LazyFieldLite field = LazyFieldLite.fromValue(messageWithExtensions);
      field.merge(createLazyFieldLiteFromMessage(emptyRegistry, emptyMessage));
      assertEquals(messageWithExtensions, field.getValue(TestAllExtensions.getDefaultInstance()));
  
      // Now reverse the order of the merging.
      field = createLazyFieldLiteFromMessage(emptyRegistry, emptyMessage);
      field.merge(LazyFieldLite.fromValue(messageWithExtensions));
      assertEquals(messageWithExtensions, field.getValue(TestAllExtensions.getDefaultInstance()));
  
      // Now try parsing the empty field first.
      field = LazyFieldLite.fromValue(messageWithExtensions);
      LazyFieldLite other = createLazyFieldLiteFromMessage(emptyRegistry, emptyMessage);
      other.getValue(TestAllExtensions.getDefaultInstance());  // Force parsing.
      field.merge(other);
      assertEquals(messageWithExtensions, field.getValue(TestAllExtensions.getDefaultInstance()));
  
      // And again reverse.
      field = createLazyFieldLiteFromMessage(emptyRegistry, emptyMessage);
      field.getValue(TestAllExtensions.getDefaultInstance());  // Force parsing.
      other = LazyFieldLite.fromValue(messageWithExtensions);
      field.merge(other);
      assertEquals(messageWithExtensions, field.getValue(TestAllExtensions.getDefaultInstance()));
    }
  
  
    // Help methods.
  
    private LazyFieldLite createLazyFieldLiteFromMessage(MessageLite message) {
      return createLazyFieldLiteFromMessage(TestUtil.getExtensionRegistry(), message);
    }
  
    private LazyFieldLite createLazyFieldLiteFromMessage(
        ExtensionRegistryLite extensionRegistry, MessageLite message) {
      ByteString bytes = message.toByteString();
      return new LazyFieldLite(extensionRegistry, bytes);
    }
  
    private void changeValue(LazyFieldLite lazyField) {
      TestAllTypes.Builder builder = TestUtil.getAllSet().toBuilder();
      builder.addRepeatedBool(true);
      MessageLite newMessage = builder.build();
      lazyField.setValue(newMessage);
    }
  
    private void assertNotEqual(Object unexpected, Object actual) {
      assertFalse(unexpected == actual
          || (unexpected != null && unexpected.equals(actual)));
    }
  
  }
  